If road traffic on a busy main road, low-flying jets out of Perth airport, or noisy neighbours are wrecking the peace inside your home, soundproof windows are the single most effective fix. Standard single glazed windows let almost all external sounds through. A properly specified soundproof double glazing system can cut perceived noise by more than 75 percent and turn a loud living space into a peaceful environment.
This guide walks Perth homeowners through how soundproof windows work, the glass and frame specs that matter, the difference between standard double glazing and acoustic glazing, and what to expect from a real installation.
How Soundproof Windows Work
Sound waves travel through air. When they hit a window, they pass through the glass and the gaps around the frame and continue into the room. A soundproof window slows those sound waves down using three mechanisms:
- Two glass panes of different thicknesses, so the panes resonate at different frequencies and cancel each other out.
- An air gap or argon-filled cavity between the panes that acts as an insulating layer for sound transmission.
- An airtight seal around the perimeter through quality window frames and a tight door seal, so noise cannot leak around the glass.
This combination is why soundproof double glazing dramatically out-performs adding heavier curtains or acoustic panels to the inside of a room. Sound enters through the weakest point in the wall, and on most Perth homes the weakest point by far is the existing windows.
Standard Double Glazing vs Acoustic Glazing
Not every double glazed window is the same when it comes to noise reduction. Standard double glazing with two equal glass panes and a 12mm air gap will cut noise meaningfully, but acoustic glazing engineered specifically for noise control will cut it much further.
Acoustic glazing uses three upgrades over standard double glazing:
- Asymmetric glass — for example one 6mm pane and one 4mm pane — so the two panes do not resonate at the same frequency.
- Laminated glass on one or both sides. The plastic interlayer in laminated glass damps sound waves and absorbs vibration.
- A wider air gap, typically 16mm to 20mm, which improves both sound insulation and thermal insulation.
The result is noise reduction glass that can drop the rated sound transmission by 35 to 45 decibels compared to a single pane window — enough to make road traffic on a busy road sound like distant background instead of an intrusion.
What Noise Levels You Can Expect to Cut
Perth homeowners near specific noise sources see different results depending on which soundproofing solutions they choose. As a rough guide:
- Road traffic on a suburban street: standard double glazed unit cuts perceived noise by around 60 percent.
- Heavy road traffic on a main road: acoustic glazing with laminated glass cuts perceived noise by 75 to 80 percent.
- Aircraft noise from Perth airport flight paths over Belmont, Cloverdale and Kewdale: laminated acoustic glazing with asymmetric panes is the only option that meaningfully reduces noise.
- Barking dogs and noisy neighbours: standard soundproof windows cut barking and conversation noise by 70 percent or more.
Numbers vary based on the wall construction around the window, but the windows are almost always the limiting factor. Once the windows are upgraded, the room becomes substantially quieter without changing anything else.
Glass Specs That Matter for Soundproofing
When you ask for a quote, the three numbers to look for on the glass specification are:
- Pane thicknesses — different on each side of the unit. For example 6.38mm laminated outer and 4mm toughened inner.
- Air gap — 16mm minimum for acoustic performance, 20mm for the best result.
- Rw rating — the standard acoustic measure. Standard double glazing rates around Rw 32. A properly specified acoustic unit can hit Rw 38 to 42, which is the level Perth airport recommends for homes under flight paths.
If the quote does not list these numbers, you are not comparing like with like. A 4-12-4 standard double glazed unit and a 6.38-16-4 acoustic unit cost different amounts and perform very differently for noise.
Frames and Seals — Where Standard Windows Fail
The glass is only half the story. Even the best noise reduction glass will fail if the frame leaks sound around the perimeter.
Aluminium frames are particularly weak for sound insulation because the hollow extrusion resonates and transmits sound straight through. Older timber sash windows are even worse because the sash itself rattles and the seals decay.
uPVC frames are the strongest performer for window soundproofing. Multi-chamber profiles trap sound between internal walls within the frame, multi-point locking pulls the sash tight against the frame for an airtight seal, and the gasket system runs continuously around the perimeter. A double glazed unit in a quality uPVC frame is the complete window system that delivers the rated acoustic performance.
Retrofitting vs Replacement
Perth homeowners with existing windows have two paths to a quieter home.
Path one is retrofitting acoustic secondary glazing inside the existing frames. This adds a second pane of glass inside the original window, creating a deep air gap between them. It is cheaper than full window replacement and works well in heritage homes where the original frames must stay. The trade off is the look and the cleaning hassle of two glass panes separated by 100mm or more.
Path two is full window replacement with soundproof double glazing in new uPVC frames. This is the better long-term answer for most Perth homes because it solves the noise problem and upgrades thermal performance, energy efficiency, security and aesthetic appeal in one job.
Energy Savings as a Bonus
Soundproof windows installed in Perth do two jobs at once. The same multi-chamber uPVC frames, asymmetric glass and wide air gap that block noise also deliver excellent insulation against heat transfer.
Homeowners typically see 20 to 35 percent reductions in cooling costs through summer once acoustic windows are installed, because the same sealing that stops sound also stops air leakage and heat gain. The cold spots near old aluminium windows in winter disappear, and the home holds its temperature far better year round.
This makes the energy savings part of the payback calculation, alongside the comfort and home value gains that come with a peaceful environment.
What Proper Installation Looks Like
Even the best soundproof window will under-perform if installation is rushed or done by someone unfamiliar with double glazed units. Proper installation includes:
- Removing the existing frame completely, not just replacing the glass.
- Checking the opening is square and stiffening any soft brick courses around the head and sill.
- Setting the new frame on packers, fixing into solid masonry, and sealing the perimeter with expanding foam.
- Finishing the internal reveal with timber or render trim so there is no air gap behind the architrave.
- Testing the seal by closing the window and checking the multi-point locking pulls the sash tight all round.
Professional installation by a glazier who understands acoustic windows is the difference between hitting the rated Rw number and losing 5 to 10 decibels through poor sealing.
Frequently Asked Questions
Do soundproof windows block all noise?
No window blocks all noise. Properly specified acoustic glazing reduces noise transmission by 75 to 85 percent compared to single glazed windows. The result is that road traffic, aircraft noise and barking dogs become background instead of intrusion, but not silence.
Are soundproof windows the same as double glazing?
Standard double glazing reduces noise but is not optimised for sound. Acoustic glazing — also called soundproof double glazing uses asymmetric glass panes, laminated glass, and a wider air gap to deliver significantly better noise reduction than a standard double glazed unit.
How much do soundproof windows cost in Perth?
Acoustic glazing costs roughly 15 to 30 percent more than standard double glazing. For a typical Perth home with 12 to 15 openings, expect around 18,000 to 30,000 dollars supplied and installed in acoustic-spec uPVC frames, depending on size and finish.
Will soundproof windows help with aircraft noise from Perth airport?
Yes. Asymmetric laminated acoustic glazing is the most effective solution for aircraft noise on flight paths over Belmont, Cloverdale, Kewdale and the eastern suburbs. The Rw 38 to 42 rating recommended for homes under flight paths can only be achieved with full acoustic spec, not standard double glazing.
Can I just add curtains or acoustic panels instead?
Heavy curtains and acoustic panels help with high-frequency noise inside the room but do almost nothing for low-frequency external sounds like traffic or aircraft. Soundproof windows are the only intervention that meaningfully reduces noise coming through the wall.
Do soundproof windows improve home value?
Yes. Homes on busy roads or under flight paths sell faster and at higher prices once acoustic windows are installed, because buyers test the noise level during inspections. The upgrade is one of the few that recovers most of its cost in resale.
Can soundproof windows be fitted to existing frames?
In most cases the existing frames need to be replaced too, especially if they are old aluminium or single-glazed timber. Acoustic glass in a leaky frame will not deliver the rated sound insulation. For heritage homes, secondary glazing fitted inside the original frame is an alternative.
Get a Quote on Soundproof Windows in Perth
Canon Double Glazing supplies and installs acoustic uPVC double glazed windows and doors across Perth, with specific experience in homes under Perth airport flight paths, on busy roads, and in noise-sensitive locations. The team can specify the right glass thickness, air gap and frame combination for the noise sources at your property.
Book a free measure and quote and we will inspect the existing windows, measure the noise sources around the home, and recommend the right acoustic glazing for the result you want. Most Perth homes can achieve a dramatically quieter living space with the right specification of soundproof double glazing.
